A method of diabatic initialization is described in which a non-recursive digital filter is applied to both the backward (adiabatic) and forward (diabatic) steps. It has clear advantages over previously proposed schemes: the initialization requires significantly less computation time and the resulting changes in the analysed fields are consistently smaller. Despite these smaller increments, the suppression of spurious high frequency noise is at least as effective as for the earlier schemes.
Reference: Mon. Wea. Rev., 125, 1976-1982.